Exemplary embodiments are directed to wireless power transfer. A wireless power transmission receiver includes a receive antenna including a parallel resonator configured to resonate in response to a magnetic near-field and couple wireless power therefrom. The receiver further includes a passive rectifier circuit coupled to the parallel resonator. The passive rectifier circuit is configured to transform a load impedance to the parallel resonator.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A wireless power transmission receiver, comprising: a power transfer component including a resonator configured to receive power from an electromagnetic field at a power level sufficient to charge a load, the resonator having an output; and a rectifier circuit coupled between the output of the resonator and the load, the rectifier circuit configured to modify an impedance at the load.
2. The receiver of claim 1 , wherein the rectifier circuit is configured as a dual-diode full-wave rectifier circuit.
3. The receiver of claim 2 , wherein the rectifier circuit is configured to modify the impedance by stepping-down the impedance by approximately 4-to-1.
4. The receiver of claim 2 , wherein the resonator includes an inductive loop and the inductive loop is coupled to ground at one of its loop terminals.
5. The receiver of claim 2 , wherein the resonator includes an inductive loop and the inductive loop is coupled to ground using a high frequency choke.
6. The receiver of claim 2 , wherein the resonator includes an inductive loop and the inductive loop is coupled to ground.
7. The receiver of claim 2 , wherein the rectifier circuit includes a high frequency choke and the resonator includes an inductive loop, the high frequency choke coupled between the inductive loop and ground.
8. The receiver of claim 2 , wherein the rectifier circuit includes at least one diode and the resonator includes an inductive loop, the at least one diode coupled between the inductive loop and ground.
9. The receiver of claim 2 , wherein the rectifier circuit includes first and second diodes and the resonator includes an inductive loop, the first and second diodes coupled between the inductive loop and ground, the rectifier circuit further including first and second high frequency chokes respectively coupled in series with the first and second diodes.
10. The receiver of claim 1 , wherein the rectifier circuit is configured as a symmetric quad-diode full-wave rectifier circuit with the inductive loop coupled to ground at its symmetry point.
11. The receiver of claim 10 , wherein the rectifier circuit is configured to modify the impedance by stepping-down the impedance by approximately 16-to-1.
12. The receiver of claim 10 , wherein the resonator includes an inductive loop and the inductive loop is coupled to ground using a high frequency choke.
13. The receiver of claim 10 , wherein the rectifier circuit includes a high frequency choke and the resonator includes a loop inductor, the high frequency choke coupled between the loop inductor and ground.
14. The receiver of claim 10 , wherein the resonator includes a double-turn inductive loop and the double-turn inductive loop is coupled to ground at its symmetry point.
15. The receiver of claim 1 , wherein the rectifier circuit is configured to modify the lead impedance by approximately 1 to 1.
16. The receiver of claim 1 , wherein the resonator includes a capacitor and the rectifier circuit includes at least first and second diodes coupled in parallel to the capacitor.
17. The receiver of claim 1 , wherein the power transfer component is configured to receive power from an electromagnetic near-field region of a transmitter.
18. The receiver of claim 1 , wherein the rectifier circuit includes a plurality of inputs, and wherein the receiver further comprises a plurality of filters for each of the plurality of inputs.
19. The receiver of claim 1 , wherein the rectifier circuit includes a shield configured to suppress harmonic signals generated by the rectifier.
20. The receiver of claim 19 , wherein the shield includes at least one of a high frequency (HF) shield, an ultra high frequency (UHF) ferrite bead, or a feed through capacitor.
21. The receiver of claim 1 , wherein the rectifier circuit includes a first capacitor and a second capacitor connected in parallel to the first capacitor, and wherein the rectifier circuit further includes a first diode and a second diode connected in series to the first capacitor and the second capacitor.
22. The receiver of claim 1 , wherein the power transfer component is a coil.
23. The receiver of claim 1 , wherein the power transfer component is an antenna.
24. The receiver of claim 1 , wherein the impedance at the load is based on a collective impedance of the rectifier circuit and the load.
25. An electronic device, including a wireless power receiver, the wireless power receiver comprising: a power transfer component including a resonator configured to receive power from an electromagnetic field at a power level sufficient to charge a load, the resonator having an output; and a rectifier circuit coupled between the output of the resonator and the load, the rectifier circuit configured to modify an impedance at the load.
26. The device of claim 25 , wherein the power transfer component is configured to receive power from an electromagnetic near-field region of a transmitter.
27. The device of claim 25 , wherein the rectifier circuit includes a plurality of inputs, and wherein the receiver further comprises a plurality of filters for each of the plurality of inputs.
28. The device of claim 25 , wherein the rectifier circuit includes a shield configured to suppress harmonic signals generated by the rectifier circuit.
29. The device of claim 28 , wherein the shield includes at least one of a high frequency (HF) shield, an ultra high frequency (UHF) ferrite bead, or a feed through capacitor.
30. The device of claim 25 , wherein the rectifier circuit includes a first capacitor and a second capacitor connected in parallel to the first capacitor, and wherein the rectifier circuit further includes a first diode and a second diode connected in series to the first capacitor and the second capacitor.
31. The device of claim 25 , wherein the power transfer component is a coil.
32. The device of claim 25 , wherein the power transfer component is an antenna.
33. The device of claim 25 , wherein the impedance at the load is based on a collective impedance of the rectifier circuit and the load.
34. A method for receiving power via an electromagnetic field, the method comprising: receiving, by a resonator, power from the electromagnetic field at a power level sufficient to charge a load, the resonator having an output; modifying an impedance at the load; and rectifying, by a rectifier circuit coupled between the output of the resonator and the load, power received by the resonator.
35. The method of claim 34 , wherein modifying an impedance and rectifying power is performed by the same rectifying circuit.
36. The method of claim 34 , wherein rectifying power includes receiving current with the rectifier circuit configured as a dual-diode full-wave rectifier circuit.
37. The method of claim 34 , wherein rectifying power includes receiving current with the rectifier circuit configured as a symmetric quad-diode full-wave rectifier circuit.
38. The method of claim 34 , wherein receiving comprising resonating in an electromagnetic near-field region of a transmitter.
39. The method of claim 34 , further comprising suppressing harmonic signals generated by rectifying the power extracted from the resonator.
40. The method of claim 34 , wherein modifying the impedance at the load comprises modifying a collective impedance of the rectifier circuit and the load.
41. A wireless power receiver, comprising: means for receiving power from an electromagnetic field at a power level sufficient to charge a load, the means for receiving power having an output; means for modifying an impedance at the load; and means for rectifying power received by the means for receiving power, the means for rectifying coupled between the output of the means for receiving power and the load.
42. The receiver of claim 41 , wherein the means for receiving power comprises a power transfer component including a wireless power receiver resonator, and wherein the means for modifying the lead impedance and the means for rectifying power comprise a rectifying circuit.
43. The receiver of claim 42 , wherein the receive power transfer component is configured to receive power from an electromagnetic near-field region of a transmitter.
44. The receiver of claim 43 , wherein the power transfer component is a coil.
45. The receiver of claim 43 , wherein the power transfer component is an antenna.
46. The receiver of claim 41 , wherein the means for modifying the impedance at the load comprises means for modifying a collective impedance of the means for rectifying and the load.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
August 24, 2009
April 30, 2013
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